Process for the preparation of propylene random copolymers

摘要

A process for the preparation of a propylene random copolymer, wherein propylene is polymerised with ethylene and/or a C4-C20 alpha-olefin in the presence of a catalyst system comprising solid catalyst particles, wherein the solid catalyst particles
(a) have a specific surface area of less than 20 m 2 /g,
(b) comprise a transition metal compound which is selected from one of the groups 4 to 10 of the periodic table or a compound of actinide or lanthanide,
(c) comprise a metal compound which is selected from one of the groups 1 to 3 of the periodic table, and
(d) comprise inclusions not having catalytically active sites.